[flexi] Change ViewCompositionStrategy for ComposeViews

The current usage of DisponseOnViewTreeLifecycleDestroyed is not
applicable to how these views are used in flexiglass.

Flag: com.android.systemui.scene_container
Fixes: 428702049
Test: manual - verify with perfetto
Change-Id: Ib776e895ebbd8515093db619b449e1c236e4937f